| Reference | {Deposit:: ALVARADO, BENJAMIN, 1970 , IRON ORE DEPOSITS OF SOUTH AMERICA, IN SURVEY OF WORLD IRON ORE RESOURCES -- OCCURRENCE AND APPRAISAL: NEW YORK, UNITED NATIONS, P. 302 - 380}{Deposit:: ECKEL, E.B., 1959, GEOLOGY AND MINERAL RESOURCES OF PARAGUAY - A RECONNAISSANCE: U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 327, 109 P.} |